Africans in Prophet Muhammad's family household!

Bismillahir Rahmaanir Raheem!
As salaamu alaikum wa rahmatullahi wa barakatuhu wa maghfiratuh!

I have been studying the seerah of our dear beloved Prophet Muhammad (SAW) for a long time and I am in the process of writing a seerah based on my studies, inhsa'Allah. I will make a few very brief statements concerning the Africans in Prophet Muhammad's (SAW) personal life. We know about Bilal, but...

The first African in Prophet Muhammad's family life:

On the way home from Yathrib to Mecca, Prophet Muhammad's mother, Aminah died. Before she died she told her servant Barakah, Umm Ayman, to care for Muhammad as your own son. Barakah, an Abyssinian, was about seventeen years old. After Aminah died most seerah's in English will state that Muhammad was taken to his grandfather who took care of him for about a year till he died.

As most know a young child is raised by women and it was no different for young Muhammad (about eight at the time). Even though he was in the care of his grandfather, everyday needs were provided for by his mother. Yes, I said his mother! Barakah became his mother when Aminah passed. Barakah had promised Aminah to raise Muhammad like her own son, which she did. Young Muhammad slept at the foot of Barakah's bed. Barakah cloth him, fed him and taught him. We can only speculate as to what she taugt him. Most mothers will teach their son about God and right and wrong, about her life and were she came from, i.e. We can conclude that Prophet Muhammad learned about Abyssinia and the Negus from his Ummi as he called her. Barakah took care of Muhammad until he got Married, at which time Lady Khadijah (RA) and Prophet Muhammad encouraged her to get married to a man in Yathrib.

They felt that she had sacrificed her youth caring for Muhammad and now was her chance to have a life of her own. From that marriage she had a son, Ayman; this is why she is better known as Umm Ayman. Barakah was the first to see and touch Prophet Muhammad, being the midwife present when he was born; also, she was present when he returned to Allah (SWT).

The second African person in Prophet Muhammad's family life:

On getting married to Lady Khadijah (RA), she gave him a gift of a male servant named Zaid. Zaid was of African decent. Prophet Muhammad grew to love Zaid dearly and the feeling was the same with Zaid; he turned down returning to his real father when his real father found him. Zaid,"The Beloved One", choice to stay with Prophet Muhammad (SAW).

The third African in Prophet Muhammad's family life:

Many years later after Zaid (RA) had married and divorced and Barakah (RA)had become a widow they married. Zaid and Barakah had a son named Usamah,"The Beloved Son of the Beloved", who who was later to be appointed head of the army by Prophet Muhammad (SAW) just before his passing. Usamah (RA) was about twenty years old. There is a great deal that can be said about these three dynamic Muslims but I will keep this short. Ma'a salaam!